...and this was him about 15 minutes later, in a deep sleep on her sofa.

The ability of a dog to fall asleep, almost at will, is one I envy.

The Chocolate Lab who was a frequent guest would arrive in my room at about 0530 and demand to be let out.
We'd go out into the front garden where he would fulfill his obligations, usually in the middle of the lawn, and then amble back to his bed.
He'd be asleep within about thirty seconds and I remained wide awake for what was left of the night.
I can't help but think that he had the better end of the deal.